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A collection of electrons is confined to an infinitely deep well or 1-D box having a 4 nm width. What wavelength photon in micrometers and nanometers when absorbed by an electron in a n=3 level will cause the electron to undergo a transition from n=3 to n=9 energy level?
If 66.5 ml of base is required to reach the second equivalence point, what is the concentration of the acid?
calculate the number of excess reagent units remaining when 41 C2H4 molecules and 102 O2 molecules react?
The compound Ca3(PO4)2 has a Ksp of 2.0 X 10-29. If the phosphate ion concentration is adjusted to a value of 2.5 X 10-2, what is the minimum Ca2+ concentration that will cause precipitation
Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam. A.) Given the following data, what is the delta Hrxn, delta Grxn and delta Srxn at 298 K
Give the bond angle and describe the shape around the central atom designated in this molecule. O in HO of H3PO4 (no H-P bond) a. trigonal planar; 120° b. trigonal planar;
In the laboratory you dissolve 15.4 g of zinc acetate in a volumetric flask and add water to a total volume of 500 mL.
calculate delta G foor the combustion of ethane: 2C2H6(g) + 7O2(g) = 4CO2(g) + 6H2O(l)
In most amines, the nitrogen atom is hybridized, with a pyramidal structure and bond angles close to 109 . In urea, both nitrogen atoms are found to be planar
Use the octet rule to predict the formula of the compound that would form between tellurium and iodine, if the molecule contains only one tellurium atom and only single bonds are formed.
Compute the boiling point elevation of a salt water solution that contains 5.90 g of NaCl dissolved in 109 ml of water. Enter the number of degrees celsius that the boiling point will be elevated.
an aqueous solution contains 0.455 m dimethylamine ch32nh.how many ml of 0.385 m perchloric acid would have to be added
a 35.00 ml sample of naoh solution is titrated to an endpoint of 14.76 ml 0.4122 m hbr solution. what is the molarity
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